Oil-based solid cosmetic composition

ABSTRACT

An oil-based solid cosmetic composition comprising one or more polyoxyalkylene modified silicones and one or more conventional cosmetically acceptable oils, pigments, paints or a mixture thereof, is provided to give a cosmetic having excellent feel during use and prolonged beautiful make-up appearance.

This is a division, of application Ser. No. 07/997,524, filed on Dec. 28, 1992, now abandoned.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an oil-based solid cosmetic composition which provides excellent feel upon use, and beautiful make-up appearance for a prolonged period of time.

2. Description of the Background Art

Conventional oil-based make-up cosmetic compositions, such as lipsticks, eye shadows, eye liners and oil-base foundations have disadvantages such as having a tendency to run or ooze, causing spots on clothing, and deterioration of the fresh make-up's appearance in a short period of time.

Several approaches to solving these problems have been proposed. Incorporation of a volatile oil into the makeup has been suggested so that, after application of the cosmetic composition, the oil evaporates leaving the coloring agents and waxes on the skin surface, thus improving the stay of the cosmetic composition. Use of a film-forming agent such as a polymer agent in combination with a volatile oil has also been suggested to improve the stay of the cosmetic composition by forming a polymer film on the skin surface after the composition is applied to the skin and dried.

However, incorporation of a volatile oil into a cosmetic composition is accompanied by a loss in the gloss of the composition over time, which is especially a problem in the case of lipsticks. Additionally, since the volatile oil evaporates over time, the shape of the lipstick becomes thinner, and the stability over time is poor.

SUMMARY OF THE INVENTION

Accordingly, one object of the present invention is to provide an oil-based solid cosmetic composition which gives excellent feel during use, and prolonged beautiful appearance.

A further object of the present invention is to provide an oil-based solid cosmetic composition which comprises one or more polyoxyalkylene modified organopolysiloxanes.

These and other objects have been satisfied by the discovery of an oil-based solid cosmetic composition comprising one or more polyoxyalkylene modified organopolysiloxanes and cosmetically acceptable pigments or oils or a mixture thereof.

DETAILED DESCRIPTION OF THE INVENTION AND PREFERRED EMBODIMENTS

The present invention relates to an oil-based solid cosmetic composition which comprises one or more polyoxyalkylene modified organopolysiloxanes and cosmetically acceptable pigments or oils or a mixture thereof.

The polyoxyalkylene modified organopolysiloxane of the present invention (hereinafter referred to as polyether modified silicones) is a compound represented by one of the following formulas (1) to (4): ##STR1## wherein R¹ to R²⁶ are the same or different from each other, and independently represent C₁ to C₃₂ linear or branched alkyl, a hydrogen atom or a phenyl group; R^(1') to R^(3') are the same or different from each other, and independently represent a C₁ to C₃₂ linear or branched alkyl group or a hydrogen atom; p, p1, p2 and p3 independently denote a number from 1 to 18; and x, x1, x2, x3, y, y1, y2, y3, m, m1, m2, m3, n, n1 and t are average numbers which make the proportion of the polyoxyalkylene group contained in the molecule from 1 to 50% by weight, preferably from 5 to 40% by weight.

Preferred polyether modified silicones (1) to (4) are those which satisfy the following conditions:

R¹ to R²⁶ : C₁ to C₂₅ linear or branched alkyl, wherein a portion of them may be a hydrogen atom,

R^(1') to R^(8') : a hydrogen atom or c₁ to C₁₈ linear or branched alkyl;

p to p3: 1 to 20,

x to x3: 1 to 50,

y to y3: 0 to 50,

m to m3: 1 to 500,

n to n1: 1 to 100,

t: 1 to 100.

Most preferably the following conditions should be met:

R¹ to R²⁶ : C₁ to C₂₂ linear or branched alkyl, wherein a portion of them may be a hydrogen atom,

R^(1') to R^(8') : a hydrogen atom,

p to p3: 1 to 5,

x to x3: 1 to 50,

y to y3: 0 to 20,

m to m3: 10 to 300,

n to n1: 1 to 50,

t: 1 to 50.

The polyether modified silicones (1) to (4) are commercially available from Nippon Unicar K.K., Shin-estu Kagaku Kogyo K.K., Toray Dowcorning Silicone K.K. or Toshiba Silicone K.K.

When water is added to an oil-based solid cosmetic composition of the present invention which comprises one or more of the polyether modified silicones (1) to (4) in a weight ratio of water to oil-based solid cosmetic composition of from 1:10 to 1:5 the relative viscosity of the composition increases to a value from 1.1 to 2.0 (relative to the viscosity of the water-free composition as 1). This increase in viscosity is especially favorable with respect to the feel of the makeup during use and prolonged beautiful appearance. The relative viscosity of the composition can be measured with an MR-3 Soliquid meter equipped with a cone plate (cone diameter: 1.798 cm, cone angle: 4.984 deg., Frequency: 1 Hz, 34° C.) manufactured by Rheology K.K.

It is essential that the polyether modified silicone of the present invention contains from 1 to 50% by weight, preferably 5 to 40% by weight, of a polyoxyalkylene group in the molecule in order to achieve excellent feel and prolonged beautiful appearance of the make-up. If the polyoxyalkylene groups are present outside this range, the effects of the invention cannot be obtained.

Further, it is preferred that the polyether modified silicones be contained in the cosmetic composition in an amount from 0.1 to 50%, more preferably from 5 to 30% by weight based on the total weight of the composition. Amounts less than 0.1% by weight will not provide a sufficient lifetime of make-up appearance, while amounts exceeding 50% by weight allow the feel of the make-up to deteriorate rapidly during use.

It is preferred that the oil-based solid cosmetic compositions according to the present invention contain one or more of the above-described polyether modified silicones, oil ingredients and pigments but be substantially free from water. Thus, it is preferred that the composition of the present invention be a non-aqueous composition.

Oil ingredients which may be used in the present invention include solid oils, semi-solid oils and liquid oils, and they may be used in a mixture of two or more. Examples of the solid or semi-solid oils include Japan wax, hydrogenated beef tallow, carnauba wax, candelilla wax, rice wax, beeswax, ceresine wax, microcrystalline wax, paraffin wax, polyethylene wax, hydrogenated jojoba oil, lanolin, and vaseline. The amount of the oil used may be varied depending on the end use of the cosmetic composition, and is in the range from 1 to 90% by weight, preferably from 5 to 70% by weight.

Examples of liquid oils which may be used in the composition of the present invention include hydrocarbons such as liquid paraffin, liquid isoparaffin (liquid polyisobutylene) and squalene; animal or vegetable oils of natural origin such as olive oil and jojoba oil; silicone oils such as dimethylpolysiloxane; and synthetic esters such as isopropylmyristate. The amount of the liquid oil ingredient used depends also on the end use desired, and ranges from 1 to 90%, preferably from 5 to 70% by weight based on the total weight of the composition.

Pigments which may be used in the present invention include conventional cosmetic pigments. Examples of the pigments include body pigments such as talc, sericite, mica, kaolin, silica, nylon powder, polyethylene powder and cellulose powder; coloring agents such as carbon black, titanium oxide, iron oxide, zinc oxide, ultramarine, prussian blue, chromium oxide, dyestuffs of the organic tar series and lakes; complex pigments such as titanated oxide and iron oxide-coated mica. The particle surface of these pigments may be optionally treated with silicones, higher fatty acids, higher alcohols, aliphatic esters, metallic soaps, amino acids or alkylphosphates. It is preferred that one or more of these pigments be contained in the solid cosmetic compositions of the present invention in an amount from 0.1 to 95%, preferably from 5 to 70% by weight based on the total weight of the composition.

The oil-based solid cosmetic composition according to the present invention may optionally contain ingredients other than those described above as long as they do not detrimentally affect the properties of the composition. These optional ingredients include other conventional cosmetically acceptable substances, such as surfactants, pharmaceutically acceptable ingredients, preservatives, antioxidants, moisturizers, UV absorbers and perfumes.

The oil-based solid cosmetic composition of the present invention may be prepared by any conventional process, such as by heating, blending or stirring the above described ingredients to form make-up cosmetics such as lipsticks, foundations, eye shadows and eye liners.

The polyether modified silicones used in the oil-based solid cosmetic composition of the present invention have a specific chemical structure, and are in a liquid state when water is not present. However, quite surprisingly, the viscosity of the polyether modified silicone rapidly increases when a small amount of water (1 to 20% by weight) is added, and further addition of water eventually causes the polyether modified silicone to acquire a gel state. At this point, no more water can be absorbed.

While not wanting to be bound by the mechanism of action of the present invention, the inventors believe that these phenomena help explain the effects of the invention as follows: When the composition is applied to the skin, it can be smoothly extended on the surface of the skin because the viscosity of the composition as manufactured is low. Pigments contained in the composition can therefore be distributed thinly and uniformly over the skin. This provides excellent feel during use and beautiful make-up appearance. After the composition is applied, the polyether modified silicone in the film formed on the skin surface becomes viscous, due to the supply of moisture from the skin or breath of the wearer. This increase in viscosity helps to hold the pigments more securely, thus providing prolonged beautiful appearance.

Having generally described this invention, a further understanding can be obtained by reference to certain specific examples which are provided herein for purposes of illustration only and are not intended to be limiting unless otherwise specified.

EXAMPLES Example 1

Lipstick

The ingredients, as shown in Table 1, were heated at 80° C., uniformly blended, cast in a mould, and cooled down to prepare lipsticks.

A panel consisting of 10 members used the lipsticks and evaluated them according to the following criteria:

Criteria:

A: Eight members or more out of ten evaluated as good.

B: Six to seven members out of ten evaluated as good.

C: Four to five members out of ten evaluated as good.

D: Three or less members out of ten evaluated as good.

                  TABLE 1                                                          ______________________________________                                                           Invention Comparative                                        Formulation       Composition                                                                              Compositions                                       (Parts by weight) L-1       L-2    L-3  L-4                                    ______________________________________                                         Ceresine          10        10     10   10                                     Paraffin wax      8         8      8    8                                      Candelilla wax    2         2      2    2                                      Squalane          25        25     25   25                                     Castor oil        37        37     37   37                                     Liquid paraffin   0         10     0    5                                      Polyisobutylene   0         0      10   5                                      Polyether modified                                                                               10        0      0    0                                      silicone (Formula (1)                                                          where R.sup.1 to R.sup.9 = CH.sub.3                                            R.sup.1'  = H, m = 50 to 100                                                   n = 1 to 5, x = 7 to 15,                                                       y = 0, p = 3; polyoxy-                                                         ethylene: 17%, MW =                                                            8000)                                                                          Titanium oxide    2         2      2    2                                      Pigment (D&C Red No. 6,                                                                          2         2      2    2                                      CI 15850)                                                                      Pigment (D&C Red No. 7 Ca Lake,                                                                  1         1      1    1                                      CI 15850)                                                                      Pigment (FD&C Yellow No. 5                                                                       3         3      3    3                                      Al Lake, CI 19140)                                                             Antioxidant       Suitable amount                                              Perfume           Suitable amount                                              ______________________________________                                    

                  TABLE 2                                                          ______________________________________                                                     Invention                                                                      Product                                                                               Comparative Products                                        Items         L-1      L-2      L-3   L-4                                      ______________________________________                                         Appearance after                                                                             A        B        B     B                                        application                                                                    Leave mark on cups                                                                           B        D        D     D                                        Color staying A        D        C     D                                        power on lips                                                                  Difficult in  A        C        B     B                                        oozing                                                                         ______________________________________                                    

As Table 2 shows, the lipstick according to the present invention provides excellent make-up appearance, and excellent ratings in the other evaluation areas.

Example 2

Oil-based foundation:

The waves and oil ingredients, listed in Table 3, were dissolved at 90° C., to which the pigments and perfume of Table 3 were mixed. The obtained mixture was cast in a metal mould, cooled down and charged into a container to prepare an oil-based foundation composition.

Similar evaluations as described in Example 1 were performed. The results are shown in Table 4.

                  TABLE 3                                                          ______________________________________                                                         Invention   Comparative                                        Formulation     Composition Composition                                        (Parts by weight)                                                                              F-1         F-2    L-3                                         ______________________________________                                         Mica (hydrophobic treatment*)                                                                  50          50     50                                          Titanated mica  9           9      9                                           (hydrophobic treatment*)                                                       Iron oxide      1           1      1                                           (hydrophobic treatment*)                                                       Ultramarine     2           2      2                                           (hydrophobic treatment*)                                                       Liquid paraffin 0           15     0                                           Diisostearyl malate                                                                            0           0      15                                          Polyether modified                                                                             15          0      0                                           silicone (Formula (1)                                                          where R.sup.1 to R.sup.9 = CH.sub.3,                                           R.sup.1'  = H, m = 50 to 100,                                                  n = 1 to 5, x = 7 to 15,                                                       y = 0, p = 3, polyoxy-                                                         ethylene: 17%, MW = 8000)                                                      Paraffin wax    5           5      5                                           Branched aliphatic                                                                             7           7      7                                           cholesteryl ester                                                              Squalane        11          11     11                                          Antioxidant     Suitable amount                                                Perfume         Suitable amount                                                ______________________________________                                          *)Hydrophobic treatment = silicone treatment                             

                  TABLE 4                                                          ______________________________________                                                    Invention     Comparative                                           Evaluation Product       Products                                              Item       F-1           F-2    F-3                                            ______________________________________                                         Long lasting                                                                              B             C      D                                              effect                                                                         ______________________________________                                    

As Table 4 shows, the oil-based foundation according to the present invention is clearly superior to the comparative products F-2 and F-3 with respect to prolonged retention of the appearance of the make-up.

Example 3

Powder cake eye shadow:

The powder ingredients listed in Table 5 were mixed with a blender, into which a heated, melted mixture of the oil ingredients in Table 5 was sprayed. The resulting mixture was further blended. The resulting material was crushed, and compression-molded with a molding machine to obtain powder cake eye shadows.

Similar evaluation as described in Example 1 were performed. The results are shown in Table 6.

                  TABLE 5                                                          ______________________________________                                                          Invention   Comparative                                       Formulation      Product     Products                                          (Parts by weight)                                                                               I-1         I-2    I-3                                        ______________________________________                                         Talc (hydrophobic treatment*)                                                                   15          15     15                                         Sericite         30          30     30                                         (hydrophobic treatment*)                                                       Titanated mica   35          35     35                                         (hydrophobic treatment*)                                                       Ultramarine      5           5      5                                          (hydrophobic treatment*)                                                       Iron oxide       2           2      2                                          (hydrophobic treatment*)                                                       Polyether modified                                                                              10          --     --                                         silicone (Formula (2)                                                          where R.sup.10 to R.sup.14 = CH.sub.3,                                         R.sup.2' to R.sup.4' = H, m1 = 50 to                                           100, n1 = 1 to 5, x1 = 7                                                       to 15, y1 = 0, p1 = 3, poly                                                    oxyethylene: 34%, MW = 10000)                                                  Diisostearyl malate                                                                             --          10     --                                         Castor oil       --          --     10                                         Liquid paraffin  2           2      2                                          Paraffin         1           1      1                                          ______________________________________                                          *)Hydrophobic treatment = silicone treatment                             

                  TABLE 6                                                          ______________________________________                                                    Invention     Comparative                                           Evaluation Product       Products                                              Item       I-1           I-2    I-3                                            ______________________________________                                         Long lasting                                                                              B             C      D                                              effect                                                                         ______________________________________                                    

Example 4

The general procedure of Example 1 was followed to prepare a lipstick, except that a polyether modified silicone of Formula (2) where R¹⁰ to R¹⁴ =CH₃, R^(2') to R^(4') =H, ml =50 to 100, n1=1 to 5, x1=7 to 15, y1=1, p1=3, with the content of polyoxyethylene being 34% (based on the weight of the polyether modified silicone) and having an average molecular weight of 10,000, was used instead of the polyether modified silicone employed in the invention product L-1.

Example 5

The general procedure of Example 1 was followed to prepare a lipstick, except that a polyether modified silicone of Formula (1) where R¹ to R⁹ =CH₃, R^(1'=H), m= 60 to 90, n=3 to 8, x=5 to 10, y=0, p=3, with the content of polyoxyethylene being 11% (based on the weight of the polyether modified silicone) and having an average molecular weight of 8,000, was used instead of the polyether modified silicone employed in the invention product L-1.

Example 6

The general procedure of Example 1 was followed to prepare a lipstick, except that a polyether modified silicone of Formula (1) where R¹ to R⁹ =CH₃, R^(1'=H), m= 20 to 70, n=1 to 5, x=7 to 15, y=0, p=3, with the content of polyoxyethylene being 26% (based on the weight of the polyether modified silicone) and having an average molecular weight of 6,300, was used instead of the polyether modified silicone employed in the invention product L-1.

Example 7

The general procedure of Example 1 was followed to prepare a lipstick, except that a polyether modified silicone of Formula (1) where R¹ to R⁹ =CH₃, R^(1'=H), m= 100 to 150, n=1 to 5, x=7 to 15, y=0, p=3, with the content of polyoxyethylene being 13% (based on the weight of the polyether modified silicone) and having an average molecular weight of 12,500, was used instead of the polyether modified silicone employed in the invention product L-1.

The lipsticks prepared in Examples 4 to 7 all provided excellent feel during use, and maintained beautiful make-up appearance for a prolonged period of time.

Example 8

The general procedure of Example 2 was followed to prepare an oil-based foundation, except that a polyether modified silicone of Formula (2) where R¹⁰ to R¹⁴ =CH₃, R^(2') to R^(4') =H, m1=50 to 100, n1=0, x1=7 to 15, y1=1, p1=3, with the content of polyoxyethylene being 34% (based on the weight of the polyether modified silicone) and having an average molecular weight of 10,000, was used instead of the polyether modified silicone employed in the invention product F-1.

Example 9

The general procedure of Example 2 was followed to prepare an oil-based foundation, except that a polyether modified silicone of Formula (1) where R¹ to R⁹ =CH₃, R^(1') =H, m =60 to 90, n=3 to 8, x=5 to 100, y=0, p=3, with the content of polyoxyethylene being 11% (based on the weight of the polyether modified silicone) and having an average molecular weight of 8,000, was used instead of the polyether modified silicone employed in the invention product F-1.

Example 10

The general procedure of Example 2 was followed to prepare an oil-based foundation, except that a polyether modified silicone of Formula (1) where R¹ to R⁹ =CH₃, R^(1') =H, m=50 to 100, n=1 to 5x=5 to 10, y=15 to 23, p=3, with the content of polyoxyethylene being 25% (based on the weight of the polyether modified silicone) and having an average molecular weight of 11,000, was used instead of the polyether modified silicone employed in the invention product F-1.

The oil-base foundations prepared in Examples 8 to 10 all provided excellent feel during use, and maintained beautiful make-up appearance for a prolonged period of time.

Example 11

The general procedure of Example 3 was followed to prepare a powder eye shadow, except that a polyether modified silicone of Formula (1) where R¹ to R⁹ =CH₃, R^(1') =H, m=50 to 100, n=1 to 5, x=5 to 15, y=7 to 15, p=3, with the content of polyoxyethylene being 17% (based on the weight of the polyether modified silicone) and having an average molecular weight of 8,000, was used instead of the polyether modified silicone employed in the invention product I-1. This powder eye shadow gave excellent feel during use, and maintained beautiful make-up appearance for a prolonged period of time.

Obviously, numerous modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described herein. 

What is claimed is:
 1. A method for coloring lips, comprising applying to said lips an oil-based solid cosmetic composition comprising:(A) one or more polyoxyalkylene modified organopolysiloxanes represented by one of the following formulas (1) to (4): ##STR2## wherein R¹ to R²⁶ are the same or different from each other, and independently represent C₁ C₃₂ linear or branched alkyl, a hydrogen atom or a phenyl group; R^(1') to R^(5') are the same or different from each other, and independently represent a C₁ to C₃₂ linear or branched alkyl group or a hydrogen atom; p, p1, p2 and p3 independently denote a number from 1 to 18; and x, x1, x2, x3, y, y1, y2, y3, m, m1, m2, m3, n, n1 and t are average numbers which make the proportion of the polyoxyalkylene group contained in the molecule from 1 to 50% by weight; (B) one or more cosmetically acceptable oils; (C) one or more cosmetically acceptable pigments; and (D) <1 wt. % water.
 2. The method of claim 1, wherein said oil-based solid cosmetic composition is free from water.
 3. The method of claim 1, wherein said oil-based solid cosmetic composition is substantially free from water.
 4. The method of claim 1, wherein said polyoxyalkylene modified organopolysiloxane is of formula (1).
 5. The method of claim 4, wherein R¹ to R⁹ are each CH₃, R^(1') is H, m is 50 to 100, n is 1 to 5, x is 7 to 15, y is 0 and p is 3 in said polyoxyalkylene modified organopolysiloxane of formula (1).
 6. The method of claim 1, wherein said cosmetically acceptable oil is selected from the group consisting of Japan wax, halogenated beef tallow, carnauba wax, candelilla wax, rice wax, beeswax, ceresine wax, microcrystalline wax, paraffin wax, polyethylene wax, hydrogenated jojoba oil, lanolin, vaseline, liquid paraffin, liquid isoparaffin, squaline, olive oil, jojoba oil, dimethylpolysiloxane, isopropylmyristate and a mixture thereof. 